//
// Created by WuShiHai on 23/11/2016.
//

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

void error_handling(char *message);

int main(int argc, char *argv[]){

    int sock;
    struct sockaddr_in serv_addr;
    char message[30];
    int str_len = 0;
    int idx = 0, read_len = 0;

    if (argc != 3 ){
        printf("Usage : %s <IP> <port>\n",argv[0]);
        exit(1);
    }

    sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP;

    if (sock == -1){
        error_handling("socket() error");
    }

    memset(&serv_addr, 0 , sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr  = inet_addr(argv[1]);
    serv_addr.sin_port = htons(atoi(argv[2]));

    if (connect(sock, (struct sockadd*)&serv_addr, sizeof(serv_addr)) == -1){
        error_handling("connect() error!");
    }

    while (read_len = read(sock, &message[idx++],1)){
        if (read_len == -1){
            error_handling("read() error!");
        }

        str_len += read_len;
    }

    printf("Message from server : %s \n",message);
    printf("Function read call count: %d \n", str_len);
    close(sock);

    return 0;
}

void  error_handling(char *message){
    fputs(message, stderr);
    fputc('\n',stderr);
    exit(1);
}